KSP PERFORMANCE 1.5in 6x139.7 Wheel Spacers for Silverado/Sierra — 78.1mm Hubcentric, Forged 6061-T6 Aluminium

KSP 1.5-inch 6x139.7 hubcentric wheel spacers widen the track of Silverado/Sierra and compatible GM trucks by 1.5 inches using forged 6061-T6 aluminum and OEM-grade hardware.

These wheel spacers are designed to bolt directly to 6x139.7 bolt-pattern GM trucks and SUVs (including Silverado, Sierra, Tahoe, Yukon, Suburban, Escalade, Avalanche, Express, and Savana models listed by year) to create extra clearance for larger wheels, a wider stance, or improved wheel fitment without modifying the hub. Each kit includes four forged spacers with a 78.1mm hub bore, M14x1.5 stud threads, and premium fasteners, plus a recommended torque spec for safe installation.

How will these spacers affect fitment and clearance on my GMC/Chevy truck?

Adding 1.5 inches per side pushes the wheel outward to provide extra clearance for wider tires, calipers, or aftermarket wheels that otherwise rub. Because these spacers are hub-centric with a 78.1mm bore, they center on the factory hub to reduce runout and vibration when installed correctly.

• Bolt pattern: 6x5.5 (6x139.7 mm) compatible with listed GM models.
• Thickness: 1.5 inches — increases track width accordingly.
• Hub bore: 78.1 mm to match factory hub centering.
• Thread pitch: M14 x 1.5 compatible with OEM lug stud sizes.

What materials and manufacturing steps ensure strength and reliability?

KSP spacers are forged from 6061-T6 aircraft-grade aluminum and CNC-machined to precise tolerances, which offers superior strength over common cast pieces while maintaining lighter weight than many steel alternatives. Fasteners use ISO/DIN 10.9–12.9 grade studs and heat-treated SCM435 bolts to resist shearing and fatigue under load.

• Material: 6061-T6 forged aluminum for high strength-to-weight ratio.
• CNC machining: accurate hole locations and uniform thickness.
• Corrosion protection: black anodized finish to resist oxidation.
• Hardware: geomet-coated, high-grade studs and heat-treated bolts.

How do I install and torque these wheel spacers safely?

Installation involves mounting the spacer to the hub with the supplied studs/bolts, seating the spacer firmly, then mounting the wheel and torquing to the manufacturer-recommended spec. KSP advises a torque range to secure the parts and includes thread locker to help prevent loosening; verify wheel/lug torque after the first 50–100 miles.

• Recommended torque: 85–95 ft·lb for final wheel/lug tightening.
• Package: four spacers per kit—one per wheel.
• Includes thread locker and adjusted stud length to aid installation.
• Tip: trim excessive stud length if it interferes with wheel fitment.

Will these spacers affect handling or require other modifications?

Pushing wheels outward changes scrub radius and track width, which can alter steering feel and load on suspension components. For a 1.5-inch spacer, most trucks in the listed range tolerate the change without additional modifications, but inspect suspension, bearings, and wheel bearings periodically and consult a professional for alignment after installation.

• Track increase: 1.5 inches per side — wider stance benefits stability in many use cases.
• Suspension: monitor for extra load on wheel bearings and tie rods.
• Alignment: recommended after installation to restore correct toe/camber.
• Compatibility check: verify stud thread pitch and hub bore match your vehicle.

Who is this for: Drivers who own compatible Chevrolet or GMC trucks and SUVs and want a durable, precisely machined 1.5-inch wheel spacer to clear larger wheels or improve stance without hub modification. These spacers suit owners who prefer forged aluminum components, OEM-style hub-centric fitment, and hardened hardware for road and light off-road use, plus anyone seeking a reversible upgrade supported by a 30-day refund and 12-month replacement policy from KSP PERFORMANCE.